Model DRK-E4C2 is A special set microphone of 6 pcs for instrument miking. Its include 1 pcs PRA-218B (For low frequency instrument), 3pcs PRA-228A (For Mid-Low frequency instrument) and 2pcs PRA-268AH (For Mid-high frequency instrument). The PRA-228A and PRA-268AH microphone body are designed as a case-swivel combination.